diff --git a/ElectronicObserver/Data/Constants.cs b/ElectronicObserver/Data/Constants.cs
index da50911e6..80d04a3a4 100644
--- a/ElectronicObserver/Data/Constants.cs
+++ b/ElectronicObserver/Data/Constants.cs
@@ -374,6 +374,7 @@ public static string GetShipClass(int id, ShipId shipId = ShipId.Unknown) =>
 		124 => "Marcello級",
 		125 => "Nevada級",
 		126 => "改氷川丸級",
+		127 => "巡潜乙型改",
 		_ => "不明",
 	};